Process and apparatus for reproducing by stamping



Nov. 4, 1930. E. o. LANHOFFER 0 PROCESS AND APPARATUS FOR REPRODUCING BY sTAMPING Filed Aug. 2, 1928 Fig.1 f

1 v/%)7/WW/f Fig.5 Fig.4

. specification and in whiching elements Patented Nov. 4, 1930 UNITED s'rAT-Es P N I QFFICE EDMOND OSCAR LANHOFFER, on POISSY, FRANCE, ASSIGNOR- ro'nsnns'ros PA LS con- .7 ronterron, or nnwYon -n; A conronarron I PROCESS AND APPARATUS FOR RE'CPRODUCIN G BY STAMPING hpplication filed August 2,1928, Serial No.

My invention relates to a 'process and ap-' paratus for reproducing by stamping.

As is known in the'art in connection with certain industries there. is frequently occasion to reproduce models by stamping a plate of a malleable substance placed on the'sur-- faceof a matrix containing the relief portions of the model in intaglio and viceversa. My invention contemplates a process for obtaining such productions with great simplicity and at the same time with great accuracy. I

According to my invention, the process consists in beating a plate of malleable mavl5 terial' placed over amatriX, with one or several successive beating elements adapted to be displaced from one extremity to the other of said matrix and of a special character which form one of the, chief objects of my invention. 1. c

"My invention likewise contemplates a ma-.

chine for carrying my process into'practi'ce, said machine 'beingp'articularly suitable for use with two or more beating elements.

Other objects of my invention will be obvious to those skilled in the art to which my invention relates in the following descripti on when taken in connection with the accompanying drawing forming part ofthis Fig. 1 is a conventional diagram illustrating in section the generalprinciples of the invention; 1: Figs. 2, 3 and4 are detail views of'the beat- 'Fig. 5is a diagrammatic elevation view with parts in section of a machine provided 1 with two successive heaters; and I Fig. 6 ma diagrammatlc detail.

' intaglio" lfis provided upon which-is vplaced the malleable material-20 which it is'jde siredto produce veryv accurately the outline ofmouldlp According to the invention'the plate 2' the malleable material according to all the Referring to Fig. '1, a matrix or m ould in' ,getherbymeansof springs 6.} It bein'oticed that if the plate "3 is "given movements of' constant amplitude by displacingin the direction offthe arrow F 7 297,041;- and inrr nc December 24, 1927.

each-carrying at its extremity a rounded weight 5.

By permittingithe beater thus arranged to fall from a relatively highdistance'on to the plate 2, the bodies 5e'Xert a pressure onsaid plate which is due to both the shock produced and the weight of the bodies 5. Certain' of: said weights, when'they attain the plate 2 take oblique 'positions such as those illustrated in Fig. 1, which has for efiect to compress the material of which the plate 2 is formed into all the folds and twists'of the mould 1.1 i

Theoretically itwould be suflicient to thus displace a single beating element in the di- '65 rection of the arrow F from one extremity of p'lateQplacedon the mould 1 to-the other. This will begsufiicient if the hollows and projections of the mould are notvery'pronounce'd and the plate 2 is of a very malleable material but'in most cases the under surface a of the plate 2 cannot be'compr e'ssedover and; into'the reliefs and hollows of the mould 1' very accurately unless the'platebe subjected to several beating operations successivelyjby means'of heating elements such' as those of Fig. 2 but in connection. with which 7 the 'weights are of gradually decreasing diam-i eters and more numerous. [It will immedi-- [ately be seen that a beating operation with a beating unit provided withrather large weights 5 will roughly. produce the' work which is completed'by successivebeating elements .by employing for example a" beating element suchiasrepres'ented in Fig; 3 a'ndif' .85

' necessary other beating elements successively whose weights gradually become smaller and more numerousin order to better compressv details of the mouldfl c c V I have discovered that the desired result is 1 produced even better by arrangingthebe'at ing elements as shown in Fig. 4. instead of a "single plate or flat me'mber to which are attached the wiresor, chains 4, two plates 3 95 and 3 are provided which are connected to- 7 from one extremity of plate 2 to the other,

' hollows. For example, the amplitude will be greater above the region B than above the region C of mould 1. Such an arrangement is very favorable because it automatically establishes a striking eiiort and compression whese magnitude will depend upon that of the hollow of the mould, that is, the plate 2 will, in fact be tamped or compressed more energetically. .1

It is to be understood that 1 may, without departing fromthe spirit of the invention, utilize beating elements such in Figs. 2 and 3 or better of the type in a and operate them by any suitable e1" rient and even be operated by hand if desired. Nevertheless it is advantageous to effect the beating operation'entirely mechanically and in this end the invention contemplates a machine particularly suitable for carrying the above described process intopractice.

The said machineis illustrated in Fig. 5 and comprises two beating elements 2 and dot the type illustrated in e connected to the extremities of a rod S'secured to a shaft 10. Said shaft is given an alternating'rotary movement by means of a crank 11 and a connecting rod 12 in turn drivenby an eccentric, piston or other suitable means (not shown).

Eachextremity of the rod-,9 carries a vertical rod 13and 1% respectively to each of which are secured the devices 7 and 8 respectively. Itwill be immediately seen that when the connecting rod 12 is given a to and fromovernent the rods 13 and'llland h nee the heating elements 7 and 8 will also be given a to and fro movement in the vertical direction and opposite to each other. On the other hand the mould covered with the plate to be beaten is placed on a carriage 15 adapted to be pro gressively advanced in the direction of the arrow F by a well known expedient (not shown such as a" pawl and ratchet arrangement,

. worm and worm wheel or the like.

It will immediately be noticed that the various parts of the plate 2 are subjected first to the sh'oclrs of beating element 8 and then to the shocks ofbeating element 7. The beating element 8 is constructed of relatively large elements small in number and the beating element 7lis composed of small elements large in number, with respect to those of element 8. r

V For adjusting the length of'strol re of the said beating elements the rods 13 and 1d are provided with a series of holes 16 and rod 9 is provided with corresponding holes through which extends a pin 18. v I

l'Vhei-i the machine commences to operate the two heating elements or at least the eiement 7 stril zes in space. if it be assumed that the relative weight of the beating elements constituted by the bar 3 be considerable with respect to the weights 5, the amplitude of the part 3 5 Jill take under the action of spring 6 a value which would risk damaging the machine. Furthermore at rest it is well to support the spring 6 in order to prevent stretching. For this purpose a hooking mechanism constituted for example by a hook 19 pivoted QO-to thelower plate 3 and hooking over the upper plate 3. WVhen the machinev starts to operate, the hook is rocked by means of a suitable lever disposedat one end of the machine. Finally -for preventing at rest, under the influence of eventual shocks, the plates 3 and 3 from moving toward and from each other there has been provided between them a mechanism. destined to maintain them constantly separated. The said mechanism is represented diagrammatically in Fig, (5 and comprises a bell-cranklever 21,22 carrying at the extremity of one of its arms a shoe 23 adapted to bear on a supporting surface 24;, preferably elastic and carried by the lowor plate 3.

By operating this mechanism in the desired direction the plates 3 and 3 tend to move away from each other but are held together by hooks 19, in a way that the said hooks completely immobilized with respect to each other.

While I have described what I deem to be a the preferable form of my. device I do not wish to be limited thereto as there might be various changes'made in the parts o-tmy machine, in: their disposition and arrangement as well as in the steps of my process without departing from the spirit of my inventionas comprehendedwithin the scope of the appended claims. 4

Having described my invention what I claim as new and desire to secure by Letters Patent is:

1. A: process. of. reproducing of thetype described which comprises placing a sheet of malleable. material on a matrix, dropping a series offlexibly suspended weights on said sheet continually and causing relative displacement between said matrixand said sheet of material during dropping of said weights.

2. A process of reproducing of the type d'escribedwhich comprises placing-a sheet of malleable material on a matrix, dropping a series of flexibly suspended weights of different sizes andweight on said; sheet continually. and successively and causing rela tive displacementbetweensaid matrix and said sheet. of material during. dropping of said weights. I

3. A process ofreproducing of the type described which comprises-placing a sheetof malleable materialon a matrix, dropping a series otflexibly suspended weights on said sheet 'continually,.said sheet'o f material and said matrix being adapted to be moved during dropping of said weights; 7

4. A process of reproducing of the type described Which comprises placing a sheet of malleablematerial on a matrix, dropping a series 'offlexibly suspended Weights of dit ferent sizes and Weight on said sheet continually and successively, said sheet of material and said matrix being adapted to be moved during droppmg of said Weights.

- 5. An apparatus of the type described comprising a mould, a plate disposed above said mould, a series of flexible elements on said plate, a rounded Weight on each of saidflexlble elements, means for reciprocating said plate iii a vertical direction, said mould bemg I adapted to be moved beneath said Weights for the purpose disclosed.

6. An apparatus of the type described comprising amould, a plurality ofplates disposed above said mould, a plurality of flexible elements on each of said plates, a series I ofrounded Weights of different sizes disposed on said plates respectively, means for reciprocating said platesin a vertical direction, said mould being adapted to be moved be,- neath said Weights for the purpose disclosed.

7. An apparatus of the type describedcomprising a mould, a plate disposed above said; mould, a second plate, spring means for sus pending said second plate from said first plate, a series of flexible elements on said sec- 0nd plate, a rounded weight on each'oi said for regulating the height of said platesabove said sheet for thepurpose disclosed;

9. An apparatus of the type described comprising a mould, a plurality of 'plates disposed above said mould, a second plate for each ofsaid first plates, spring means for sus- I pending said second plates from. saidfirst plates, a series of flexible elements on each of said second plates, a seriesof rounded weights of different sizes dlsposed respectively on the flexible elements of said plates, means for re ciprocating said plates in a vertical d rection,

said mould'being adapted to'bemoved beneath said Weights for the purpose disclosed.

R10. An apparatus of thektype described;

comprising a mould, a plate disposed above said mould, a secondplate, spring means for suspending said second plateffrom said first plate, a series of flexiblev elements on said i 1 second plate, a rounded Weight on each of said flexible elements, means for reciprocating 'said'vplatesiinva vertical directiomand means for preventing separation of said plates under theactlon of said We1ghts,sa1d

mould being, adapted to be moved beneath said lieigllts forthe purpose disclosed, 4

11. An apparatus of the type described comprising a mould, a plurality of plates disposed above, said mould, a second plate for each otsaid firstplates, spring means for suspendingsaid second plates iromsaidfirst plat-es, a seriesoif flexible elements on each of said second plates, 'a series of rounded Weights ofdifi'erent sizes disposed respectively on the flexible elementsof said plates, meansfl itor reciprocating said plates in the vertical, and means for preventing separation "of'said plates under the actionsof said Weights, said mould being adapted to be 'moved beneath said Weights for the purpose disclosed.

12. An apparatus of the type described comprising a: mould, a plate disposed above said mould, a second plate, spring meansfor suspending said second plate from said first plate, a serles of flexlble elementson said second plate, a rounded Weight on each of said flexible elements, means for reciprocat- 7 ing saidplates in the vertical, anda manually controlled latching lever for preventing separation of said plates under the action of said'weights,'said mould being adapted to be moved beneath said Weights for the purpose v disclosed. flexible elements, means for reciprocating '13. An apparatus of the type described comprising a mould, a plurality of plates disposed above said mould, a second plate for each of said firstplates, spring means for suspendingsaid secondplates from said first plates, a series or" fiexibleelements on each of said second plates, a series of rounded Weights of ,diiierent sizes disposed respectively n the flexible elements of said plates,

vertical, and amanually controlled latching lever for preventing separation of said plates under the action of said Weights, said mould 'means for" reciprocating said platesin the t being] adapted to be moved beneath said,

Weights for the purpose disclosed.

14. In an apparatus of the type described t i the combination of an operating shaft, means for imparting alternate rotary movement to said shaft, a two-armed lever on said shaft, a rod connected to each of said arms,a plate carried by each ofsaid'rods, a spring on each of said plates, a second plate suspended'on each of said springs, a plurality of Weights flexibly suspended from one of said second plates, a plurality of. relatively smaller Weights suspendedflexibly from the otherfof I said platesand a displaceable mould beneath said Weights for the purpose described.

15. In an apparatus 'of'the type described v the combination of an operating shaft, means i for impartlngalternate rotary movement to said shaft, a two-armed leveron said shaft,

4- r i r 1,780,580

a rod 'adjustably and pivotally secured to each of said arms, a plate carried by each of said rods, a spring on each of said plates, a second plate suspended on each of said springs, a plurality of Weights flexibly suspended from one of said second plates, a plurality of relatively smaller Weights suspended flexibly from the other of said plates, manually releasable latching means for prevent- 10 ing separation of said plates under the action of said Weights and a mould adapted to be moved beneath said Weights for the purpose described. v

In testimony, that I claim the foregoing as 15 my invention, I have signed my name this 20th day of July, 1928.

' EDMOND OSCAR LANHOFFER. 

